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Thread: Need some help with a code 43

  1. #1
    Fuel Injected!
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    Feb 2014
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    Need some help with a code 43

    1988 k2500 with a brand new gm goodwrench tbi 350 and 700r4. On the highway with cruise control on at 65 when it hits a small hill and downshifts from 4th to 3rd the cel will come on with a code 43 (knock sensor). I can get knock counts on tunerpro when i hit the exhaust manifold with a hammer. When im out driving i dont see any knock counts. Not even when starting it up. Also the connection i have between the ecm and tunerpro is pretty crappy. When you are sitting at a red light just idling in gear it shows connection error but the second you hit the accelerator to take off the connection restores. Anyway i need help on what to try next to get rid of this cel from turning on.

  2. #2
    Fuel Injected!
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    Feb 2014
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    Upstate, NY
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    So the knock sensor ohms out at 3.9k ohms and i am able to see knock counts in tuner pro when hitting the exhaust. Here is a data log that was taken when the light was cleared and when the light turned on. Is there any way to test the esc module?
    Attached Files Attached Files

  3. #3
    Fuel Injected! sturgillbd's Avatar
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    Jun 2012
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    Big Stone Gap, VA
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    You have the wrong knock sensor. If it reads 3.9 k , that sensor is for the later PCM. If you have a 7747 the sensor should be approximately 100k. The 3.9k sensors were used on the 1993 up PCMs with red and blue connectors such as a 16197427.

  4. #4
    Fuel Injected!
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    Your right. I put in a 100k knock sensor and the check engine light has not come on since. Thanks

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